Something that I remember back when I was a kid/preteen I remember liking the simplistic designs of many of the units because what had caught my attention was the combination of the basic weapon designs and the animations from both the first and second AoE games,… I also personally loved the idea of the upgrades in Age of Mythology visually upgrading that units part ‘weapon, armor and shield’
So while I’m not saying every unit has to be designed in a simple way, I just hope that in AoE4 that the team restrains themselves on overdesigning some of the units, allowing the younger players to fully absorb and appreciate the graphics and models of the units individual weapons and armor, and their animations.